Thermomechanical treatment method for preparing high strength high corrosion-resistant Al-Mg-Zn aluminum alloy in short process

Abstract

The invention relates to a thermomechanical treatment method for preparing a high strength high corrosion-resistant Al-Mg-Zn aluminum alloy in a short process and belongs to the field of aluminum alloys and preparation processes thereof. The method comprises the following steps: carrying out solution quenching on a panel after hot rolling an aging precipitation strengthened Al-Mg-Zn serial aluminum alloy; carrying out pre-aging treatment for 15-30 hours at 60-120 DEG C after quenching; then carrying out 10-60% of temperature controlled rolling deformation within a range from the room temperature to 200 DEG C; and carrying out final aging treatment for 3-15 hours at 120-160 DEG C after rolling. By introducing the thermomechanical treatment method, compared with a conventional process, a recrystallization annealing process is cancelled, and the final aging treatment insulating time is shortened, so that the panel preparation process flow is shortened, and meanwhile, the strength (comparable to 7050-T7651) and the intercrystalline corrosion resistance of the panel are improved greatly. The thermomechanical treatment method has important reference value in developing high strength corrosion-resistant aging precipitation strengthened Al-Mg-Zn aluminum alloy of ships and special vehicles.

Description

technical field [0001] The invention belongs to the field of aluminum alloys and their preparation, and in particular relates to a deformation heat treatment method capable of industrialized production and short process for preparing high-strength and high-corrosion-resistant Al-Mg-Zn aluminum alloys. technical background [0002] Energy crisis and environmental pollution have become the themes of the new era. In order to reduce energy consumption and environmental pollution, lightweight is imperative. The 5xxx series aluminum alloys with high Mg content are the preferred materials for special vehicles and ships because of their good corrosion resistance, formability, weldability and medium strength. At present, the materials that have been maturely used include alloys such as AA5083, AA5383 and AA5059. Among them, the AA5059 alloy registered by the American Aluminum Association in 1999 has greatly increased the content of Mg, Zn and Cu in the alloy on the basis of AA5083, ...

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Problems solved by technology

[0005] In order to overcome the existing deficiencies, the preparation process of the aging-precipitation-strengthened Al-Mg-Zn alloy sheet is long and consumes a lot of energy, and compared with the 7xxx series aluminum alloys, there is still insufficient strength; compared with the 5xxx series aluminum alloys, there are still Excessive difference in corrosion resistance

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